Example of calling a BAPI in tRFC

You cannot call the BAPI BAPI_ACC_DOCUMENT_POST inside the update task because it performs a CALL SCREEN Statement.

You can call the BAPI in tRFC, this should work as follows:

CALL FUNCTION 'BAPI_ACC_DOCUMENT_POST'

        DESTINATION 'NONE'

         EXPORTING

           documentheader    = gs_documentheader

         IMPORTING

           obj_key           = lv_key

         TABLES

           accountgl         = it_accountgl

           accountpayable    = it_accountpayable

           accounttax        = it_accounttax

           currencyamount    = it_currencyamount

           return            = it_return  .

  

     IF  sy-subrc = 0.

  

         CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'

           DESTINATION 'NONE'

           EXPORTING

             wait = 'X'.

         CALL FUNCTION 'RFC_CONNECTION_CLOSE'

           EXPORTING

             destination          = 'NONE'

           EXCEPTIONS

             destination_not_open = 1

             OTHERS               = 2.

     ENDIF.